Chlorine dioxide, in comparison with other prevalent disinfectants, can be 10 times more expensive per each gram, but considering its effectiveness in disinfection, required concentration of it in comparison with chlorine is normally between 1/4 to 1/20. Furthermore, considering side costs of using chlorine or other disinfectants in terms of biofilm formation, corrosion, byproducts and …., it can be concluded that chlorine dioxide is a cost effective disinfectant.